Purple and green(anoxygenic Photptrophic) bacteria Phase contrast micrograph and (b)transmission electron micrograph of the greeen bacterial consortium chlorochromatium aggregatum. In(a) the nonphototrophic central ogani smis much lighter in color than the pigmented phototrophicbacteria Note the chlorosomes(arrows)in(b). The entire consortium is about 3*6umPurple and Green(Anoxygenic Photptrophic) Bacteria